Septarian

For the idea that took its time becoming itself.

Stone

Septarian concretion

Major Sources

Madagascar, Utah, England & New Zealand

Treatment

Usually natural

Septarian is a concretion, a nodule of hardened clay and carbonate mud whose interior cracked, most likely as it shrank, with the cracks later filled by calcite and sometimes aragonite. It's sold whole, cut into halves and polished into eggs, spheres and freeforms.